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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace AnonymMethods { class Program { static void Main(string[] args) { int localInt = 123; SomeClass sc = new SomeClass(); sc.SetDelegate(SomeHandler); SomeClass.SomeDelegate d = new SomeClass.SomeDelegate(SomeEventHandler); sc.SomeEvent1 += d; // assigning anonymous methods with or without params sc.SomeEvent1 += delegate { Console.WriteLine("Anonymous method "); }; // << works without param - why? sc.SomeEvent1 += delegate(string msg) { Console.WriteLine("Anonymous method "+msg); }; sc.SomeEvent1 += delegate { Console.WriteLine("Anonymous method with local var "+localInt); }; // << works without param - why? // lambda expression - like alias for above examples sc.SomeEvent1 += (string msg) => { Console.WriteLine("Lambda expression " + msg); }; // start testing... sc.SomeDelegateMethod(); sc.SomeEventMethod(); Console.ReadLine(); } public static void SomeHandler(string Aparam) { Console.WriteLine(Aparam); } public static void SomeEventHandler(string Aparam) { Console.WriteLine(Aparam); } } class SomeClass { // delegate public delegate void SomeDelegate(string Aparam); private SomeDelegate listOfHandlers; public void SetDelegate(SomeDelegate method) { listOfHandlers += method; } //event public event SomeDelegate SomeEvent1; // firing methods public void SomeDelegateMethod() { if (listOfHandlers != null) { listOfHandlers("someDelegateMessage"); } } public void SomeEventMethod() { if (SomeEvent1 != null) { SomeEvent1("someEventMessage"); } } } } |